Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e91c3db1466ab13…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 05:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9bf8297db9cb6424bf7e1f02728fc2f SHA-1: 053a94aa7669d19ea55a32bdf9d7cb9cfce87f45 SHA-256: 9e91c3db1466ab1382410698e407307c1c4557a486fee695dece71609cb47848
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of compromised CMS upload links suggests an attempt to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://tootingtaxi.com/survey/userfiles/files/10471451608.pdf In PDF document text
    • http://dostavkaturov.ru/files/file/kekobekebolobaze.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/91250054696.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/35520439741.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/geretebim.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/kapajedobisukovonorura.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/losakajawesarajunavefip.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/dehgfocagen3m6l9f0daiegrek/gamolenelixav.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/wavopabupelol.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/fikupegimivupajoxurozusu.pdfIn PDF document text
    • http://goldmustang.ru/files/files/7478733750.pdfIn PDF document text
    • http://hingliltd.com/userfiles/mepizezas.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161303e8051a47---66510306367.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/26470153674.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161324b5fad518---81500861691.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/63401802056.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0f164ede73cfc06af1f5ea0442c3aba4/7764103715.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/pizazaman.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/xanokuxomex.pdfIn PDF document text
    • http://lscapital.it/images/file/8096431895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=new+blogger+themesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 17540 bytes
SHA-256: 09b55d629fa9cc12ea4ae34e085c3f430c53bddf085b12b0ee4ed9c09ce41507
font_01_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13409 10400 bytes
SHA-256: 0775329bd05661a364ec12ed5af892add05a180270b5d9bd5e104f741ca5bbfe